Charles henry kelsall



CHARLES HENRY KELSALL, OF HORWIOH, ENGLAND.

HANUFAGTURE OF HIGH-PEB-GENT.-HANGANEBE STEEL.

Specification of Letters Patent.

Patented Dec. 10, 1907.

Application filed March 4 190?. Serial No- 860.663-

To all whom it mo concern:

Be it known t at I, CHARLES I'IENRY KELSALL, subject of England, residing at 613 Chorley New Road, Horwich, in the county of Lancaster, England, metallurgmal chemist, have inventedcertain new and use ful Improvements in or Relating to the Manufacture of High-Per-Oent.-Manganese Steel, of which the following is a specification.

This invention refers to improvements in or relates to the manufacture of high per cent. manganese steel, and has for its object that of adding a. mild or low carbon steel which is overcharged with oxids to molten rich ferro-manganese80 to 82 percent. This I carry into effect in the following manncr:-This steel is made either in a converter, 0 )en hearth acid or basic furnaces, or by other convenient or desired method. This steel must be low in carbon and silicon, and of a somewhat spongy or porous nature, the degree of s ongmess or porousness being ruled or a ected according to the percentage of manganese required in a resulting metal which shall at the same time be sound. The method of obtaining a steel (which as bereinbefore stated is a steel overcharged with oxids) is by adding an excessive quantity of oxid of iron in, the form of iron ore of about one cwt. to a ton of steel in the furnace at a time when the percentage of carbon in the steel is low and thus enabling the degree of spongincss or porousness to be easily gage-d by sampling from the furnace in the ordinary manner, and there not being enough carbon in the steel to readily'expel or reduce the oxids. Before tap ing the steel into a ladle or other vessel, Icontcnd it is advisable and convenient-in fact essentialt0 add about five and one-half percent. of ferro-manganese in the furnace, thereby increasing the temperature and clearing the slag". The addition of five and one-half percent. of form-manganese to the furnace is insufficient to kill the steel or in other words to convertthe oxide by the amount of carbon which the ferro-mangancsc contains but is ample for the purpose for which it is intended, i. e. for the pur )osc of raising the temperature of the meta )rior to tapping" and also clearing the slag". The remaining portion ol" the form-manganese to bring up the requisite percent: e is melted in a crucible furnace, either of the ordinary type, or better by a blast or wind blown crucible furnace, such as, what is well known in the trade as the Bauman or Morgan tilting furnaces.

The molten term-manganese is run into a ladle (which for distinction I will call No. 1) which has been previously heated to prevent chilling, after which the steel overcharged with oxids which has previously been tapped into another ladle (I will call No. 2) is, while in a molten state, run into ladle No. 1, and will alloy with the ferro-manganese and form a resultant metal up to the mixture or quality desired and will then be manganese steel: The residue steel in the ladle No. 2 being capable of being used as ordinary steel when properly treated-if desired this manganese steel may be manipulated with one ladle direct from the furnacein which case the form-manganese is put into the ladle prior to the molten steel overcharged with oxids being run into the said ladle. B so manufacturing or manipulating the be orementioned steel it will then be possible to roll, for e, smith or cast into any desired or required form or'section, and the steel will be suitable for the manufacture of armor plates, gun-forgings, projectiles, tramway-rails, points and crossings, dredger work and others requiring hard wearing material, and owing to being non-magnetic or feebly magnetic it is suitable for electrical p1 oses.

aving now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that I make no claim to the hereinbefore described process except when a mildthat is to sav, a low carbon steel is used which is overc arged with oxide and a small percentage of ferro-manganese is added in the furnace as described.

What I claim is- A method of manufacturing a high percent. manganese steel which consists in treatin a mild or low carbon steel overcharged Wlth oxid while in the furnace to form-manganese, and then admixin therewith molten rich form-manganese, a ter tapping.

In testimony whereof, I have hereunto set my hand in presence of two subscribing witmesses.

crmnhns HENRY KELSALL.

Witnesses:

EDMUND Onenwrox, Jae. STEWART Bnoanroo'r. 

